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Weston, J.D. (1955)
Portugaliae mathematica
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Weston, J.D. (1955)
Portugaliae mathematica
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Conrad, Paul (1959)
Portugaliae mathematica
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Ján Jakubík, Gabriela Pringerová (1988)
Časopis pro pěstování matematiky
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Ján Jakubík (1991)
Czechoslovak Mathematical Journal
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